On 08/06/2014 08:36 AM, Yuanzhen Gu wrote: [please don't top-post on technical lists] > Thanks very much Eric! This is exactly what I guessed, I just wondering > where I could find this piece of code and control the the pause time of > guest, while the snapshot being taken? thanks ! Actually, for new enough qemu (one with the 'transaction' QMP command), or for a guest where only one disk is being snapshotted, there is no pause required. See qemuDomainSnapshotCreateDiskActiveExternal in src/qemu/qemu_driver.c. When a pause is required, it is only for the fraction of a second required to issue a followup qemu QMP command to resume the guest, so there is no need for a knob to control the pause time (it is as already as fast as possible). -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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